Safely open local_submit files
Safely open local_submit files

The file opened during local_submit is controlled by the student. Make
sure it's not a symlink. Uses O_NOFOLLOW, so no part of the path may be
a symlink

autolab/Autolab,cg2v/Autolab,cg2v/Autolab,autolab/Autolab,cg2v/Autolab,autolab/Autolab,cg2v/Autolab,autolab/Autolab,autolab/Autolab,autolab/Autolab,cg2v/Autolab,cg2v/Autolab